864523511 has 4 divisors (see below), whose sum is σ = 864783192. Its totient is φ = 864263832.

The previous prime is 864523507. The next prime is 864523531. The reversal of 864523511 is 115325468.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 864523511 - 2² = 864523507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864523531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124781 + ... + 131526.

It is an arithmetic number, because the mean of its divisors is an integer number (216195798).

Almost surely, 2^864523511 is an apocalyptic number.

864523511 is a deficient number, since it is larger than the sum of its proper divisors (259681).

864523511 is a wasteful number, since it uses less digits than its factorization.

864523511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259680.

The product of its digits is 28800, while the sum is 35.

The square root of 864523511 is about 29402.7806678212. The cubic root of 864523511 is about 952.6329585248.

Adding to 864523511 its reverse (115325468), we get a palindrome (979848979).

The spelling of 864523511 in words is "eight hundred sixty-four million, five hundred twenty-three thousand, five hundred eleven".